.secondmenu a {
font-size: 12px;
color: #4A515B;
text-align: center;
}
.secondmenu li.active {
background-color: #eee;
border-color: #428bca;
}

<style type="text/css"> ...... </style>

<a href="#systemSetting" class="nav-header collapsed" data-toggle="collapse">
<i class="glyphicon glyphicon-cog"></i>
系统管理
<span class="pull-right glyphicon glyphicon-chevron-toggle"></span>
</a>
<ul id="systemSetting" class="nav nav-list collapse secondmenu" style="height: 0px;">
<li class="active"><a href="#"><i class="glyphicon glyphicon-user"></i> 用户管理</a></li>
<li><a href="#"><i class="glyphicon glyphicon-th-list"></i> 菜单管理</a></li>
<li><a href="#"><i class="glyphicon glyphicon-asterisk"></i> 角色管理</a></li>
<li><a href="#"><i class="glyphicon glyphicon-edit"></i> 修改密码</a></li>
<li><a href="#"><i class="glyphicon glyphicon-eye-open"></i> 日志查看</a></li>
</ul> 
